2001012111 has 12 divisors (see below), whose sum is σ = 3303258192. Its totient is φ = 1143435456.

The previous prime is 2001012109. The next prime is 2001012131. The reversal of 2001012111 is 1112101002.

It is a happy number.

It is not a de Polignac number, because 2001012111 - 2¹ = 2001012109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2001012093 and 2001012102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001012131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15880986 + ... + 15881111.

It is an arithmetic number, because the mean of its divisors is an integer number (275271516).

Almost surely, 2^2001012111 is an apocalyptic number.

2001012111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2001012111 is a deficient number, since it is larger than the sum of its proper divisors (1302246081).

2001012111 is a wasteful number, since it uses less digits than its factorization.

2001012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31762110 (or 31762107 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 2001012111 is about 44732.6738637430. The cubic root of 2001012111 is about 1260.1335440466.

Adding to 2001012111 its reverse (1112101002), we get a palindrome (3113113113).

The spelling of 2001012111 in words is "two billion, one million, twelve thousand, one hundred eleven".